StackPrism

PyPI package

Werkzeug 1.0.1 vulnerabilities, and the version that fixes all of them

Werkzeug 1.0.1 has 10 known vulnerabilities (2 rated high or critical); 3.1.9 fixes all of them.

PyPI (opens in a new tab) describes it as “The comprehensive WSGI web application library.”

Known vulnerabilities
10
2 rated high or critical
Released
Mar 31, 2020
Latest is 3.1.9
Licence
BSD-3-Clause
OpenSSF Scorecard
6/10
pallets/werkzeug (opens in a new tab)
Dependencies
None
Resolved by deps.dev

What to upgrade to

3.1.9 is the closest release with no known vulnerabilities.

  • 3.1.9Upgrade to this

    Fixes all 10 known vulnerabilities and the latest release. Released Sep 27, 2026.

    No known vulnerabilities

3.1.9 came out on Sep 27, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Hand the fix to your coding agent

One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.

Findings

Every advisory for Werkzeug 1.0.1

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. WarningCVE-2022-29361 on OSV.dev (opens in a new tab)PYSEC-2022-203EPSS: top 6%

    ** DISPUTED ** Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with multiple requests included i…

    Fixed in 2.1.1. Published May 25, 2022.

  2. CriticalCVE-2024-34069 on OSV.dev (opens in a new tab)GHSA-2g68-c3qc-8985EPSS: top 12%

    Werkzeug debugger vulnerable to remote execution when interacting with attacker controlled domain

    Fixed in 3.0.3. Published May 6, 2024.

  3. CriticalCVE-2023-25577 on OSV.dev (opens in a new tab)GHSA-xg9f-g7g7-2323EPSS: top 28%

    High resource usage when parsing multipart form data with many fields

    Fixed in 2.2.3. Published Feb 15, 2023.

  4. WarningCVE-2023-46136 on OSV.dev (opens in a new tab)GHSA-hrfv-mqp8-q5rwEPSS: top 36%

    Werkzeug is a comprehensive WSGI web application library. If an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are a…

    Fixed in 2.3.8. Published Oct 25, 2023.

  5. WarningCVE-2024-49766 on OSV.dev (opens in a new tab)GHSA-f9vj-2wh5-fj8jEPSS: top 46%

    Werkzeug safe_join not safe on Windows

    Fixed in 3.0.6. Published Oct 25, 2024.

  6. WarningCVE-2026-27199 on OSV.dev (opens in a new tab)GHSA-29vq-49wr-vm6xEPSS: top 55%

    Werkzeug safe_join() allows Windows special device names

    Fixed in 3.1.6. Published Feb 19, 2026.

  7. WarningCVE-2025-66221 on OSV.dev (opens in a new tab)GHSA-hgf8-39gv-g3f2EPSS: top 58%

    Werkzeug safe_join() allows Windows special device names

    Fixed in 3.1.4. Published Dec 2, 2025.

  8. LowCVE-2023-23934 on OSV.dev (opens in a new tab)GHSA-px8h-6qxv-m22qEPSS: top 59%

    Incorrect parsing of nameless cookies leads to __Host- cookies bypass

    Fixed in 2.2.3. Published Feb 15, 2023.

  9. WarningCVE-2026-21860 on OSV.dev (opens in a new tab)GHSA-87hc-h4r5-73f7EPSS: top 61%

    Werkzeug safe_join() allows Windows special device names with compound extensions

    Fixed in 3.1.5. Published Jan 8, 2026.

  10. WarningCVE-2026-102598 on OSV.dev (opens in a new tab)GHSA-g6x2-hccm-hh4mEPSS: top 71%

    Werkzeug safe_join() allows Windows special device names

    Fixed in 3.1.9. Published Oct 5, 2026.

Is Werkzeug the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly Werkzeug 1.0.1, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and PyPI. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against PyPI, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.